Chawkey, do you have access to market depth? If you have a look at the sell side there is an order of 4 x 1m that goes in in the morning, and by the afternoon it dissapears.
Im suspecting that these could be intended to manipulate or at least assist in making the stock appear as if there is a lot more to sell. I see this happen all the time, especially for stocks that have potential. Here is a copy of the current sell side at 12c